Method of purifying tin-bearing ferrotungsten



Patented Sept. .19, 1922. 1

TENT QFFICE.

FREDERICK BECKET, OF NIAGARA FALLS, NEW YORK.

METHOD OF PURIFYING- TIN- BEARING- FERROTUNGSTEN.

Application filed May 26, 1920. Serial No. 384,268.

T ll whom it may concern: of water, ill give a-satisfactory extraction Beit known that I, FREDERI K M. BEoKnT, when the alloy is ground to 100 mesh or a citizen of the United States, residing at finer, Whereas with the 8 mesh alloy, it

Niagara Falls, in the county of Niagara pears essential to employ the more conce-n- 40 and State of New York, have invented certrated acid in order to obtain the optimum tain newv and useful Improvements in extraction. Methods of Purifying TinBearing Ferro- In order to extract the .tin it is sufiicient tungsten, of which the following is aspecito charge the comminuted alloy with the ficatiom acid into a rotary Wooden barrel, and to 45 10 This invention is a method for the purifi-' Inmntain the charge under slow movement cation of tin-bearing ferrotungsten, such for for about 2 hours at a temperature of 5563 example as ferrotungsten prepared from 0.; or for a correspondingly longer time at Chinese wolframite, which often contains a lower temperature, say for instance about sufficient tin to render the product practi- 24: hours at 25 C. v cally worthless for many purposes. In the case of a ferrotungsten prepared I have discovered that a commercially as above and containing 0.6% of tin, it was complete elimination of the tin content of found possible under proper operating ferrotungsten' resulting from the commerditions to extract 8090% of the total tin cial reduction of such ores may be secured Content of the alloy, with a loss of tungsten 55 by treating the ferrotungstcn, preliminarily .not exceeding 2 to of the total tungsten ground or crushed to suitable size, with content. The tin content of the treated alloy either sulfuric. or hydrochloric acid; (H varied from 0.03 to 0.06%, which is sutii-- these solvents, hydrochloric acid affords the ciently low to satisfy most commercial rebetter extraction of tin, and is accordingly quirements. i 60 to be preferred when a nearly complete I claim elimination of tin, say 8595% of the total 1. 'Method of purifying tin-bearing ferrotin content, is required. Sulfuric acid 15 less tungsten, WlllCll consists in reacting on th costly however and may be used when a comminuted alloy with an acid solvent for somewhat lesser extraction of tin ((5777 tin. 65

will sufiicle, 2. 'Method of purifying tin-bearing ferro- In practice the ferrotungsten is ground tungsten, .which consists in reacting on the t b t 8 mesh or preferably tiner,.depend'- comminuted alloy wit-h an aqueous solution ing largely upon the concentration of acid of hydrochloric acid. 7 -used.- For example either concentrated hy- In testimony whereof, I aflixmy signa- 70 drochloric acid, or a mixture of 1 part by ture.

volume of the concentrated acid with 5 parts FREDERICK M. BECKET. I 

